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(4)
The ambient temperature must
be
23°C
±
2°C.
(5)
The power
supply
to the
frequency standard
must
be uninterrupted.
42
The
counter should be allowed
to
warm
up
for
one hour (switched
to
standby,
if
required)
before beginning
the specification check.
Input
A
Sensitivity
PVP
43
Required
equipment
includes a
digital
multimeter,
signal
generator, audio generator,
and
BNC
T-Connector
(see
Table
6.1;
Items
3, 4,
5,
and
7).
44
Complete
the
following procedure:
(1)
Turn on
the counter. Select 50
ohms
for
Input A.
(2)
Connect
the
test
equipment
as
shown
Fig
6.9
A. Verify that the
EXT STD LED
lights.
SIGNAL
GENERATOR
10
MHz
STD
OUT
EXT
STD
INPUT
COUNTER
RF
J
ABC
O
0
o
Fig 6.9A Connections
for
Input
A
Sensitivity
PVP
(D
(3)
Set,
in
turn,
the
signal
generator output
to
the frequencies
shown
in
Table
6.5
A. Set the counter's
resolution to
the corresponding
values.
TABLE
6.5A
Input
A
Sensitivity
(I)
Frequency
1994 Resolution
Signal
Level
160
MHz
8
digits
40
mV
100
MHz
8
digits
20
mV
10
MHz
7 digits
20
mV
100
kHz
5
digits
20
mV
(4)
For each selected frequency,
determine
the
minimum
input level
to
the
counter
that provides stable counting.
Verify that these
minimum
levels
do
not
exceed
those
shown
in
the
table.
(5)
Disconnect
the
test
equipment.
6-26
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